Steady squares: Difference between revisions
Added Lua
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=={{header|Lua}}==
<syntaxhighlight lang="lua">
do --[[ find steady squares - numbers whose square ends in the number
e.g.: 376^2 = 141 376
--]]
-- checks wheher n^2 mod p10 = n, i.e. n is a steady square and displays
-- a message if it is
local function possibleSteadySuare ( n, p10 )
if ( n * n ) % p10 == n then
io.write( string.format( "%4d", n ), "^2: ", n * n, "\n" )
end
end
local powerOfTen = 10
-- note the final digit must be 1, 5 or 6
for p = 0,10000,10 do
if p == powerOfTen then
-- number of digits has increased
powerOfTen = powerOfTen * 10
end
possibleSteadySuare( p + 1, powerOfTen )
possibleSteadySuare( p + 5, powerOfTen )
possibleSteadySuare( p + 6, powerOfTen )
end
end</syntaxhighlight>
{{out}}
<pre>
1^2: 1
5^2: 25
6^2: 36
25^2: 625
76^2: 5776
376^2: 141376
625^2: 390625
9376^2: 87909376
</pre>
=={{header|MAD}}==
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